Fertilizer by crop

Longan

In-season longan (northern Thailand), harvested around July–August. This plan follows Department of Agriculture guidance matched to our formulas for full clusters, firm stalks and AA-grade fruit.

Year-round fertilizer calendar

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

1After harvest & pruning

2Build reserves before flowering

3Flowering & fruit set

4Fruit sizing

530 days before harvest

✂Harvest

Coloured bars show when to apply at each stage. The current month is highlighted.

Stage-by-stage plan

Aug – Sep

After harvest & pruning

Revive the tree, push new leaves after pruning and rebuild the soil.

Recommended

Chemical Fertilizer 15-15-15Ma Ngao brand

Chemical Fertilizer 30-0-0Ma Ngao brand

Organic Fertilizer OM 20%, Powder & GranuleSam Ma Ngao brand

Rate & method: 15-15-15 mixed 1:1 with 30-0-0, 1–2 kg/tree, plus organic fertilizer, spread under the canopy at the first leaf flush.

Or choose

Mor Kaset Plus 6-6-6 + OM 10%Sam Ma Ngao brand

Chemical Fertilizer 16-8-8Ma Ngao brand

Chemical Fertilizer 25-7-7Ma Ngao brand

The official advice mixes 46-0-0 with 15-15-15; our 30-0-0 works too — use slightly more than 1:1.

Oct – Dec

Build reserves before flowering

Harden the leaves, stop new flushes and store energy for strong flower clusters.

Recommended

Chemical Fertilizer 8-24-24Ma Ngao brand

Rate & method: 8-24-24 at 1–2 kg/tree once the last leaf flush starts to mature.

Or choose

Mor Kaset Plus 4-8-8 + OM 10%Sam Ma Ngao brand

Chemical Fertilizer 9-9-9Ma Ngao brand

For off-season longan induced with chemicals, follow local expert advice and shift the calendar to your induction date.

Jan – Mar

Flowering & fruit set

Reduce fruit shedding in hot, dry weather; firm stalks and clean skin.

Recommended

Chemical Fertilizer 15-15-15Ma Ngao brand

Orthosilicic Acid + Gold (H4SiO4), GranuleMa Ngao brand

Rate & method: 15-15-15 at 1–2 kg/tree at fruit set, plus Orthosilicic Acid+ Gold granules to help the tree cope with heat and drought.

Or choose

Chemical Fertilizer 12-12-17Ma Ngao brand

Chemical Fertilizer 16-8-8Ma Ngao brand

Keep watering steady during fruit set — don’t let the soil dry out hard.

Apr – Jun

Fruit sizing

Grow large, thick-fleshed fruit evenly across the cluster.

Recommended

Chemical Fertilizer 13-13-21Ma Ngao brand

Rate & method: 13-13-21 at 1–2 kg/tree when fruit reach about 0.5 cm.

Or choose

Chemical Fertilizer 12-12-17Ma Ngao brand

Chemical Fertilizer 15-10-30Ma Ngao brand

For heavily loaded trees, split into two applications about a month apart.

Jun – Jul

30 days before harvest

Boost sweetness, crisp dry flesh and fruit weight to reach AA grade.

Recommended

Chemical Fertilizer 14-7-35Ma Ngao brand

Rate & method: 14-7-35 at 1–2 kg/tree about 30 days before harvest.

Or choose

Chemical Fertilizer 15-10-30Ma Ngao brand

Chemical Fertilizer 10-10-30Ma Ngao brand

Chemical Fertilizer 13-13-21Ma Ngao brand

The usual advice is 0-0-60 at this point; our high-potassium formulas work too, with some nitrogen to keep leaves healthy.

Add every time you fertilize

Orthosilicic Acid+ Gold applied with your NPK to condition the soil, release locked-up nutrients and help trees handle heat and drought.

Orthosilicic Acid + Gold (H4SiO4), GranuleMa Ngao brand

Choose the approach that fits your farm

Easy start — keep your formulas

Keep your usual formulas and add Orthosilicic Acid+ Gold each time you fertilize.

Orthosilicic Acid + Gold (H4SiO4), GranuleMa Ngao brand

Recommended

Full programme

Follow the five stages above, matching the formula to what the tree needs at each point.

Chemical Fertilizer 15-15-15Ma Ngao brand

Chemical Fertilizer 8-24-24Ma Ngao brand

Chemical Fertilizer 13-13-21Ma Ngao brand

Chemical Fertilizer 14-7-35Ma Ngao brand

Organic focus for tired soil

After harvest, rebuild the soil with Mor Kaset Plus 6-6-6 or OM 20% organic fertilizer, then add NPK by stage.

Mor Kaset Plus 6-6-6 + OM 10%Sam Ma Ngao brand

Organic Fertilizer OM 20%, Powder & GranuleSam Ma Ngao brand

Good to know

Trees aged 1–3 years: 15-15-15 with 30-0-0, 100–200 g/tree, three times a year.
Test soil and leaves first so you apply what the tree actually lacks.
Apply on moist soil, spread across the canopy area or in a shallow trench around it.

Rates on this page are general guidance for bearing trees. Adjust for tree age, canopy size, crop load and soil test results. Months are approximate and vary by region.

Source: Department of Agriculture: Longan production guide (Horticulture Research Institute)

Not sure? Ask a local dealer — our team will visit your farm.

Other crops

Durian Coconut Rubber Oil palm Rice

Want a plan for your own farm?

Tell us your crop, tree age and the problems you see — our agronomists will plan it with you for free.

Talk to our team 092-3636-914